Device for electropneumatic brakes.



W. V.TURNER.

DEVICE FOR ELECTROPN'EUMATIC BRAKES.

Mmm/www man oc. zu. |916.

Lmfm. mmm M.' m w 9.

WMWWWWWUWWQV by www.

lio

Since in making a reduction in brake pipe pressure to apply the brakes, the equalizing reservoir pressure reduces at substantially the same rate as brake pipepressure, the opposing fluid pressures on piston 2O reduce at the same rate, so that the piston is not moved from its normal position, and it will therefore be seen that since the brake cylin der exhaust is closed by the energization of the release magnet, the brakes will be held applied while the operator shifts from one end of the car to the other.' i

When the operator applies the brake valve handle at the opposite end of the car and turns the brake valve to running position, the brake pipe is recharged with fluid to the normal pressure. In handle oli' position, the

eolualizing` reservoir is cut ed from the brake pipe, so that while the brake pipe pressure is increased by the movement of the handle.

at the operating end, the equalizing reservoir pressure at the non-operating end remains at the reduced pressure.

The increased brake pipe pressure in valve chamber 2l then overcomes thereduced equalizing reservoir pressure in piston chamber 19 and the piston 20 thereupon shifts the valve vso as to uncover a port 34, leading to the switch piston 14. Fluid under pressure from valve chamber 21 is then supplied to piston chamber 13 and the switch piston 14 is thereby operated to open the switch contacts. The release magnet 2 is thus denergized and the release of the brakes is e'ected.

In the outer position of valve 21, cavity 29 connects exhaust port 30 to equalizing reservoir passage 24 through a restricted port, so that any leakage of fluid into the equalizing reservoir at the non-operating end will escape to the atmosphere and'thus preventpossible building vup of pressure inv piston chamber 19, such as might cause movement of the piston to normal position By, means of the above construction, the brakes are held applied when the operator removes the brake valve handle and goes to the opposite end of the car, and are automatically released when thehandle is applied atthe opposite end. i

Having now described my invention, what I claim as new,.and desire to secure by Letters Patent, is

1. In, an electro-pneumatic brake, the combination with electrically f controlled d means for eiecting the release ofthe brakes,

of a manually operated switch device for controlling said means and adapted in handle 0E position to eiiect the operation of said means for preventing the release of the brakes. p

2. In an4 electro-pneumatic brake, the combinationl with a valve for controlling the release of the brakes and an electromagnet adapted upon energization for closexhaust of Huid from the brake cylinder,

of a manually operated device at cach end of the car for controlling said means and adapted in handle oin position to operate said means for closing the brake cylinder exhaust and means for automaticallyopening said exhaust wlien'the operating handle is applied at the opposite end of the car.

. 4. In an electro-pneumatic brake, the combination with a brake cylinder and electrically controlled means for controlling the exhaust of liuid from the brake cylinder, of a manually operated device at opposite ends of the car for controlling said means and adapted upon removal of the operating handle at one end of the carto eiect the operation of said means for preventing the exhaust of fluid from the brake cylinder and a device operated upon applying the handle at the opposite end of the car for `effecting the operation of said means to open the exhaust.

5. In an electro-pneumatic brake, the combination with electrically operated means for controlling the release of the brakes, of a brake pipe and a switch device operated upon an increase in brake pipe pressure for opening the electric circuit of said means.

6. In an electro-pneumatic brake, the combination with electrically operated means for controlling the release of the' brakes, of a brake pipe normally containing fluid under pressure, Ameans operated upon a reduction in brake pipe pressure Jfor eiecting an application of the brakes, and an electric switch device operated upon an increase in brake pipe pressure for opening the electric circuit of said electrically operated means.

7. In an electro-pneumatic brake, the combination with electrically operated means for controlling the release of the brakes, a brake pipe, a valve device oper- .ated upon a reduction in brake pipe `presmeans for controlling the release of the brakes, a brake pipe, a valve device operated upon a reduction in brake pipe pres- Lemerre sure for effecting en eppiicetion of the oiekes, and e brake valve device having en equaliziiig reservoir9 of a switch for controlling the electric circuit oi' said ineens and e valve device subject to the opposing pressures ofthe breire pipe and the equalizing reservoir for controlling seid switch and 'adapted uponan increase in brake pipe pressure to operare' seid switch for opening seid circuit.

i 9. iin en electro-pneumatic brake, the combination with e brake cylinder, an electre-magnet adapted 'upon energizetion to Giese the exhaust from the brake cylinder, e brake pipe, e valve device operated upon @meier er thin @meer mehr be @brewed for me mening emrah, by eiriressmr iheemmiii automatic adapted. iii handle off position to energizeo the circuit of seid electro-magnet, of en switch mechanism subject to the opposing pressures ofI the brake pipe andA equalizing reservoir and adapted to open said. oiroiiiI upon rioovementy of the brake 25 valve device to a, position for' 'supplying Huid to the brake pipe. Y i

In testimony whereof I have hereunto sei my hand.

WALTER V TURNER.

ir er miente,

Weeiiiiiigiroe, iid. iii. 

